PET geogrid d taɣawsa n ufesniyent i ttesseqdac s mliḥ deg tesnub n tban, asagi deg tḥebsa n tmeddurt n tmerwin n tmerwin. Yettwassan-d seg ttefthalat Ɣef wakk-as i wamḍa n usenɣan n tban. Asuɣt-nnes amɣawsa yesɛa s tmeddit n ugar n tselleft, ay d-yewwḍen i t-id-s.